<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>id选择器</title>
		<style type="text/css">
			#div{
				width: 800px;
				height: 100px;
				background-color: red;
			}
			#div{
				width: 800px;
				height: 100px;
				background-color: blue;
				
			}
			.divp{
				width: 800px;
				height: 100px;
				background-color: red;
				margin: 0%;
			}
			
		</style>
	</head>
	<body>
		<div class="divp>
			
		</div>
		<div id="div2">
			
		</div>
		<p class="divp"></p>
		
	</body>
</html>